ZL50120 Zarlink, ZL50120 Datasheet - Page 49

• Manufacturer Part Number: ZL50120
• Description: 32 / 64 / 128 Channel CESoP Processors
• Manufacturer: Zarlink

Each of the 11 data flows uses the Task Manager to route packet information to the next block or interface for
onward transmission. The flow is determined by the Type field in the Task Message (see ZL50115/16/17/18/19/20
Programmers Model).
6.3
The ZL5011x family offers the following types of TDM service across the packet network:
Unstructured services are fully asynchronous, and include full support for clock recovery on a per stream basis.
Both adaptive and differential clock recovery mechanisms can be used.
Structured services are synchronous, with all streams driven by a common clock and frame reference. These
services can be offered in two ways:
•
•
In either structured mode, N x 64 Kbps trunking is supported as detailed in “Payload Order” on page 53.
6.3.1
The TDM Interface contains two basic types of interface: unstructured clock and data, for interfacing directly to a
line interface unit; or structured, framed data, for interfacing to a framer or TDM backplane.
Unstructured data is treated asynchronously, with every stream using its own clock. Clock recovery is provided on
each output stream, to reproduce the TDM service frequency at the egress of the packet network. Structured data is
treated synchronously, i.e. all data streams are timed by the same clock and frame references. These can either be
supplied from an external source (slave mode) or generated internally using the on-chip stratum 3/4/4E PLL
(master mode).
Unstructured
asynchronous
Structured synchronous
(N x 64 Kbps)
Synchronous master mode - the ZL5011x provides a common clock and frame pulse to all streams, which
may be locked to an incoming clock or frame reference
Synchronous slave mode - the ZL5011x accepts a common external clock and frame pulse to be used by
all streams
TDM Interface
Service type
TDM Interface Block
Table 20 - TDM Services Offered by the ZL50115/16/17/18/19/20 Family
T1, E1, J2, E3, T3 and
STS-1
T1, E1 and J2
Framed TDM data
streams at 2.048 and
8.192 Mbps
TDM interface
ZL50115/16/17/18/19/20
Zarlink Semiconductor Inc.
49
Bit clock in and out
Data in and out
Bit clock out
Frame pulse out
Data in and out
Bit clock in
Frame in
Data in and out
Interface type
Line interface unit
Framers
TDM backplane (master)
Framers
TDM backplane (slave)
Interfaces to
Data Sheet